Rolling mill



L. IVERSEN ROLLING MILL Filed Aug. 5, 1926 Patented Oct. 23, 1928.

"UNITED STTEE PATENT oFFics LORENZ 'IVERSEN, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR T MESTA MACHINE I COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CURPORATIOE OF PENNSYLVANIA.

' aottrue min.

Application filed August 5, 1926. Serial No. 127,298.

This invention relates to rolling mills, and. particularly to those mills wherein the Working rolls which actually enga *e the material being rolled are provided with backing-up a rolls.

In certain kinds or rolling, particularly the rolling of sheets and strip material, it is found desirable to use working rolls of rela tively small diameter and to supply the addiin tional resistance to rolling forces required to prevent deflection of such rolls under load by utilizing backing-up rolls. In some cases a three-high mill is used, in which case only one of the working rolls is provided with a backing-up roll. In this case the unsupported working roll is generally of larger diameterthan the supported roll. It is customary, however, in mills of this character, to provide a four-high mill in which the working rolls are of substantially the same diameter and are both provided with a backing-up IOllJ It is customary in mills of this character to drive the backing-up rolls, and to depen upon friction for the transmission of power from a backing-up roll to its Working roll. Ordinarily this practice is open to certain objections, among them being the fact that if slippage occurs between a work roll and its backing-up roll a flat spot will be worn on :10 the work roll and this will result in an inferior product. 4 Various ways of overcoming the diiliculty have been roposed. For example, in the patent to hartener, No. 1,522,473, spring pressure is employed to supply a force between a work roll and its backing-up roll, in

addition to the ordinary rolling force. In

my copending application, Serial No. 120,308,

. filed July 3, 1924, I have described and 49 claimed a rolling mill wherein one of the work rolls is positively driven and the other ,1 is 1flrictionally driven through its backing-up By the present invention Iprovide asim- 5 ple and effective way of driving the working rolls without any of the difiiculties encountered in the-various arrangements heretofore proposed. I provide a plurality of backingup rolls for a working roll, and preferably drive all of the backing-up rolls. By this arrangement a much better drive from the backing-up rolls to the working roll is provided and slippage is eliminated or n1inimized. With this arrangement no particular '55 relation of diameters need exist between the hacking-up rolls and the working rolls, and therefore the working rolls may be dressed as many times as desired Without interrupting-the mill operation.

In the accompanying drawings, Wllijl] illustrate more or less d1agraminatically the present preferred embodiment of my. invenv 1010 Figure l is a side elevation of a set of rolls iii a will stand, together with the drive shaft pinions and couplings;

F igure 2 is a section taken on the line LIL-H of Figure l; and

Figure 3 is a section taken on the line III-11 of Figure 1.

In the illustrated embodiment of the invention there is shown a pair of working rolls 2, each provided with two backing-up rolls 3. Power is supplied to each of the backingup rolls from any desired source through a power shaft 4. The power shaft 4: is connected to a pinion which meshes with a pinion 6. The pinions 5 and 6 are preferably of substantially the same diameter as the working rolls although this is not essential.

The pinion 5 also meshes with two gears 7 which preferably correspond in diameter to the backing mp rolls 3. The pinion 6 meshes with two similar gears 7 a It will be noted from Figures 2 and 3 that the gears 5, 6, 7- 2nd 7 occupy substantially Y the same relative position as the rolls 2 and 3. The gears 7 and 7 are each connected to their corresponding hacking-up rolls 3 through spindles 8 and couplings 9; The usual provision for adjustment of the rolls in the mill stand is of course provided.

It will be seen that each of the working rolls instead of making one frictional con tact with a hackingup roll, makes two such contacts at points spaced around the roll. Therefore, the possibility of slippage is very materially reduced. The arrangement thus eliminates the many troublesome features of earlier mills of this character. v

I have illustrated and described a preferred embodiment of the invention. It will he understood, however, that it is not limited to such form since more than two hacking-up rolls may be employed or other changes may and tivuly driven oackmgup r011s,.and a single chive means for the several backingmp rolls.

2. A rolling mill, comprising a a'ir 0f WOIkiII rolls each having a plum ity of driven Backing-up rolls, a pinion set made of gears and pinions of-the same general 1 diameter asthe rolls and arranged. in the same 1113211121 as said. mus, and cmmectioru; between the. pinion set and the backing-up rolls. Y

In tqslz'fmong whereof I have hereunto sei:

my hanai.

LORENZ IVERSEI I. 

